The historian talks presidential relationships, gun control and dealing with baseball nerves

Your book The Bully Pulpit is about two U.S. Presidents. I understand writing a book about Theodore Roosevelt. But William Howard Taft?
Taft was Roosevelt's handpicked successor. I didn't know how deep the friendship was between the two men until I read their almost 400 letters, stretching back to their early 30s. It made me realize the heartbreak when they ruptured was much more than a political division.

Do female historians look at history through a different lens than male ones?
I know that relationship is the thing that interests me, because I think it gets at the inner...